If you are still using your SM-G900T, you are likely facing app compatibility issues, security vulnerabilities, or extreme sluggishness. A custom ROM solves these problems by replacing the T-Mobile Android 6.0 Marshmallow stock OS.
Most modern custom ROMs will trip Google’s SafetyNet. To use banking apps or Google Pay, you will likely need to install Magisk and use "DenyList" to hide the root status from specific apps. Final Verdict sm-g900t custom rom
Let me know your choice!